Research On Reason And Prevention About Ablation Of Aerial Insulation Line

lOkV distribution system is the main system of urban power distribution. Aerial insulation line is widely used in urban power network. We make the 10kV system caused by the system fault tree, foreign objects such as lap in transmission line greatly reduced by using it, effectively improve the operation reliability of 10kV power distribution system.With the wide use of lOkV aerial insulation line,10kV aerial insulation line will often appear on fire and the ablation conditions, especially in the coastal and heavy pollution area. In recent years, Dalian area power grid construction and transformation use a large number aerial insulation lines. At the same time, some problems are exposed. The frequency of occurrence increase in ground faults in power distribution lines, in addition to external damage or breakage by lightning strikes and other factors, aerial insulation line insulation layer in the binding has ablation phenomenon seriously, it destroys the insulation and multiple happened in coastal areas where pollution level is higher. After preliminary investigation, we found that the ablation site centralized fixed insulated wire binding, in the insulating pillar parts.This paper focuses on the analysis of ablation of insulation at the root cause, and through running test and laboratory simulation test of aerial insulation line,analysis that the ablation of aerial insulation line is provided by the wire leakage current truncation crevasse formation at the current intensive areas in some local caused. On the basis of the conclusions.we found out that "sprayed RTV coatings", "with a silicon rubber umbrella group"," prevent the current focus on the wire "," prevent the current flow through the short period surface" 4 kinds of effective measures or the others to solve the ablation. A comprehensive comparison in economy, complexity of construction, anti ablative effect and other aspects, we find" prevent the current flow through the short period surface" is relatively simple, low cost, and suitable for applications of Dalian grid transformation.